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PCA9541APW/01 Datasheet(PDF) 45 Page - NXP Semiconductors

Part # PCA9541APW/01
Description  2-to-1 I2C-bus master selector with interrupt logic and reset
PDF  45 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA9541APW/01 Datasheet(HTML) 45 Page - NXP Semiconductors

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NXP Semiconductors
PCA9541A
2-to-1 I2C-bus master selector with interrupt logic and reset
© NXP Semiconductors N.V. 2014.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 24 April 2014
Document identifier: PCA9541A
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
22. Contents
1
General description . . . . . . . . . . . . . . . . . . . . . . 1
2
Features and benefits . . . . . . . . . . . . . . . . . . . . 2
3
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4
Ordering information . . . . . . . . . . . . . . . . . . . . . 3
4.1
Ordering options . . . . . . . . . . . . . . . . . . . . . . . . 3
5
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6
Pinning information . . . . . . . . . . . . . . . . . . . . . . 5
6.1
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6.2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 6
7
Functional description . . . . . . . . . . . . . . . . . . . 6
7.1
Device address . . . . . . . . . . . . . . . . . . . . . . . . . 6
7.2
Command Code . . . . . . . . . . . . . . . . . . . . . . . . 7
7.3
Interrupt Enable and Control registers
description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.3.1
Register 0: Interrupt Enable (IE) register
(B1:B0 = 00b) . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.3.2
Register 1: Control Register (B1:B0 = 01b) . . 11
7.4
Interrupt Status registers. . . . . . . . . . . . . . . . . 15
7.4.1
Bus control lost interrupt . . . . . . . . . . . . . . . . . 15
7.4.2
Recovery/initialization interrupt. . . . . . . . . . . . 15
7.4.3
Downstream interrupt . . . . . . . . . . . . . . . . . . . 16
7.4.4
Functional test interrupt . . . . . . . . . . . . . . . . . 16
7.4.5
Register 2: Interrupt Status Register
(B1:B0 = 10b) . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.5
Power-on reset . . . . . . . . . . . . . . . . . . . . . . . . 17
7.6
External reset . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.7
Voltage translation . . . . . . . . . . . . . . . . . . . . . 18
8
Characteristics of the I2C-bus . . . . . . . . . . . . 19
8.1
Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8.2
START and STOP conditions . . . . . . . . . . . . . 19
8.3
System configuration . . . . . . . . . . . . . . . . . . . 20
8.4
Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.5
Bus transactions . . . . . . . . . . . . . . . . . . . . . . . 21
9
Application design-in information . . . . . . . . . 24
9.1
Specific applications . . . . . . . . . . . . . . . . . . . . 24
9.2
High reliability systems . . . . . . . . . . . . . . . . . . 25
9.3
Masters with shared resources. . . . . . . . . . . . 26
9.4
Gatekeeper multiplexer . . . . . . . . . . . . . . . . . 26
9.5
Bus initialization/recovery to initialize slaves
without hardware reset . . . . . . . . . . . . . . . . . . 27
10
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 28
11
Thermal characteristics . . . . . . . . . . . . . . . . . 28
12
Static characteristics . . . . . . . . . . . . . . . . . . . . 28
13
Dynamic characteristics . . . . . . . . . . . . . . . . . 30
14
Test information . . . . . . . . . . . . . . . . . . . . . . . . 32
15
Package outline. . . . . . . . . . . . . . . . . . . . . . . . 33
16
Soldering of SMD packages . . . . . . . . . . . . . . 36
16.1
Introduction to soldering. . . . . . . . . . . . . . . . . 36
16.2
Wave and reflow soldering. . . . . . . . . . . . . . . 36
16.3
Wave soldering . . . . . . . . . . . . . . . . . . . . . . . 36
16.4
Reflow soldering . . . . . . . . . . . . . . . . . . . . . . 37
17
Soldering: PCB footprints . . . . . . . . . . . . . . . 39
18
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 42
19
Revision history . . . . . . . . . . . . . . . . . . . . . . . 42
20
Legal information . . . . . . . . . . . . . . . . . . . . . . 43
20.1
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 43
20.2
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
20.3
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 43
20.4
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 44
21
Contact information . . . . . . . . . . . . . . . . . . . . 44
22
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45



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